Turns out it was the ACL and a partial MCL tear. Anyway, had my first commute, post-surgery today (had surgery on 11/22). Felt good, and it was a nice brisk morning here in Austin. My surgery leg's quad muscle is really atrophied though, I'm working on getting it back to size. Leading up to the commute I have been doing some daily easy paced riding with a gradual build up in length and speed. Having to go slow for a while has made me re-appreciate bike riding though. I don't race against myself all the time anymore, I tend to enjoy it more.

Free advice: don't tear your ACL, the few weeks after surgery suck and I'm still working regaining full flexibly in my knee.